fix sphinx errors

Author: ianhi

{{cookiecutter.github_project_name}}/docs/source/conf.py

@@ -29,7 +29,7 @@
     'sphinx.ext.napoleon',
     'sphinx.ext.todo',
     'nbsphinx',
-    'jupyter_sphinx.embed_widgets',
+    'jupyter_sphinx.execute',
     'nbsphinx_link',
 ]
 
@@ -197,12 +197,13 @@
 #
 nbsphinx_allow_errors = True # exception ipstruct.py ipython_genutils
 
+from sphinx.util import logging
+logger = logging.getLogger(__name__)
 
 def setup(app):
-    app.setup_extension('jupyter_sphinx.embed_widgets')
     def add_scripts(app):
         for fname in ['helper.js', 'embed-bundle.js']:
             if not os.path.exists(os.path.join(here, '_static', fname)):
-                app.warn('missing javascript file: %s' % fname)
-            app.add_javascript(fname)
-    app.connect('builder-inited', add_scripts)
+                logger.warning('missing javascript file: %s' % fname)
+            app.add_js_file(fname)
+    app.connect('builder-inited', add_scripts)